《2025年小学数学计算10分钟四年级下册北师大版》

1. 口算。(48分)
$19a + 43a =$ $5a - a =$ $x + x + x =$ $6y - 5y =$
$5.4 - 1.7 =$ $1.1×0.2 =$ $6.2 - 4.3 =$ $1.7×0.4 =$
$5.3 + 9.8 =$ $7.5 - 7.1 =$ $9.6 - 7.7 =$ $3.3 - 1.6 =$
$3.1×0.2 =$ $2.2 - 1.4 =$ $6.9 + 3.6 =$ $3.1 + 6.5 =$
$1.5 + 1.8 =$ $2.28 + 8.8 =$ $0.4×22 =$ $61.2÷1000 =$
$1.3 - 0.13 =$ $2.8×0.5 =$ $17 - 7.3 =$ $0.32×0.3 =$
$3.6×5 =$ $0.14 + 0.86 =$ $3.5×2 =$ $1.1 - 0.2 =$
$6.9 - 3.9 =$ $2.84 - 1.5 =$ $2.1 + 1.09 =$ $3.16 + 0.9 =$
$0.07×0.8 =$ $81.5÷100 =$ $0.5×0.12 =$ $1.5 + 0.5 =$
$3.9 - 2.3 =$ $5.02 - 4.2 =$ $2.1 - 2.08 =$ $4.3 - 0.4 =$
$1.5 - 0.05 =$ $3.5 + 8.1 =$ $8 - 7.3 =$ $6.44 - 4 =$
$0.41×0.2 =$ $2.19 - 1.62 =$ $1.66 - 0.43 =$ $0.2 + 2.01 =$

答案： 1. 62a 4a 3x y
3.7 0.22 1.9 0.68
15.1 0.4 1.9 1.7
0.62 0.8 10.5 9.6
3.3 11.08 8.8 0.0612
1.17 1.4 9.7 0.096
18 1 7 0.9
3 1.34 3.19 4.06
0.056 0.815 0.06 2
1.6 0.82 0.02 3.9
1.45 11.6 0.7 2.44
0.082 0.57 1.23 2.21

2. 解方程。(18分)
$3x - 9.5 = 8.5$ $8x + 90 = 330$ $4x - 23 = 33$
$3x + 24 = 96$ $2x - 2.8 = 7.2$ $7x - 15 = 20$
$x÷0.6 = 60$ $x - 1.2 = 8.8$ $8x - 12 = 36$

答案： 2. x = 6 x = 30 x = 14
x = 24 x = 5 x = 5
x = 36 x = 10 x = 6